Guide to accessing a nested and potentially optional object property with a default value and specifying its data type

Just a simple query here... my goal is to extract data.user.roles, but there's a possibility that data may be empty. In such cases, I want an empty array as the output. Additionally, I need to specify the type of user - which in this instance is any. This is the solution I have devised:

const { data } = useSession()
const user: any = data?.user || {} // defining user
const roles = user?.roles || []

It does the job, but it doesn't seem very efficient.

Moreover, I'm uncertain if this approach will hold up if useSession doesn't fetch the complete dataset:

type Session = {
  data: {
    user?: {
        roles?: string[]
    }
  }
}
const {
  data: {
    user: { roles = [] }
  }
}: Session = useSession()

Answer №1

data is always present in the Session type, so using a ? after it is unnecessary. Simply destructure data and provide a fallback at the end.

const { data } = useSession()
const roles = data.user?.roles ?? []

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